Credit: The Associated Press

WASHINGTON — Gun homicides have dropped steeply in the United States since their 1993 peak, a pair of reports released Tuesday showed, adding fuel to Congress' battle over whether to tighten restrictions on firearms.

A study released Tuesday by the government's Bureau of Justice Statistics found that gun-related homicides dropped from 18,253 in 1993 to 11,101 in 2011. That's a 39 percent reduction.